Mercruiser Upper Gearcase Pre/R/MR/Alpha One 1.98 Gearset 43-55778A3 120hp 140hp
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- All 120hp 2.5L & 140hp 3.0L 4cyl applications for Pre-Alpha/R/MR/ALPHA ONE Gen 1, so 1970-1990 as a general rule.
- (Actually these were also used on Gen II drives 1991-1997)
- The gear set here is 43-55766 / 43-55778 > 43-55778A3 (Sierra equivalent 18-2205) (Also Equivalent to 43-55766A2 / 43-55766A3)
- 20-24 (tooth count) 1.98 Ratio for 4-cylinder GM Chevy 120hp 2.5L 153CID / 140hp 3.0L 4cyl 181CID sterndrive engines.
- If you have any questions on compatibility, or any other questions about this item, please don't hesitate to contact me.
- Freshwater Used Parts.
- These look great and were removed from a completely functional upper gearcase.
- Purchase with confidence!
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